finally use air for reloading

air.toml

@@ -0,0 +1,10 @@
+# .air.toml
+[build]
+  cmd = "go build -o ./tmp/main"
+  bin = "tmp/main"
+  full_bin = "tmp/main"
+  include_ext = ["go", "tpl", "tmpl", "html", "js"]
+  exclude_dir = ["tmp", "vendor", "node_modules"]
+
+[log]
+  time = true